Total RNA-seq libraries were prepared using the SMART-Seq Stranded Kit (Clontech) following the manufacturer’s instructions. Poly(A) RNA-seq libraries were prepared as previously described (56 (link)) using a SMARTer ultralow input RNA cDNA preparation kit (Clontech). A Nextera XT DNA library preparation kit (Illumina) was used for poly(A) RNA-seq cDNA fragmentation, adaptor ligation, and amplification according to the manufacturer’s instructions. The prepared RNA-seq libraries were sequenced on NextSeq 550 (Illumina) with paired-ended 75-bp reads.